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NES/Famicom-oriented modules

nes_hardware module

The nes_hardware module is imported automatically on NES targets.

TODO

nes_mmc4 module

The nes_mmc4 module is imported automatically on the NES MMC4 target. and contains routines related to MMC4 bankswitching.

void set_prg_bank(byte a)

Changes the $8000-$BFFF PRG bank.

void set_chr_bank0(byte a)

Changes the CHR bank 0 ($0000-$0fff in the PPU memory space).

The high nibble (0 or 1) selects between chrrom0 and chrrom1 segments. The low nibble L (0-$F) selects a 4K-aligned address in the segment ($L000).

void set_chr_bank1(byte a)

Changes the CHR bank 1 ($1000-$1fff in the PPU memory space).

The high nibble (0 or 1) selects between chrrom0 and chrrom1 segments. The low nibble L (0-$F) selects a 4K-aligned address in the segment ($L000).

void set_vertical_mirroring()

Switches nametable mirroring to vertical.

void set_horizontal_mirroring()

Switches nametable mirroring to horizontal.